Norwich City midfielder Alex Tettey felt they let themselves down in defeat to Manchester United.
Tettey featured in Sunday's 3-1 home defeat.
He told VG: "I got a shock. I don't know how we can be so naive and give away so much space. That should not happen.
"We have a right-back who is in no man's land, we have a centre-back who is higher than the other, and he's one does not know where the attacker is. The goal that should not happen.
"If you let such goals in the Premier League time and again, you have no chance. It's okay to let in goals, but not in that way. I'm still very p***ed about it.
"I should not be too strict, but I think we make 'junior football mistakes'."
